英文:
Fine-tuning an already trained XGBoost classification model
问题
I have trained an XGBoost classification model for sentiment analysis of product reviews. However, there are certain cases where the model predictions are not as expected. For example, when I input the review "The delivery was a bit late but the product was awesome", the model classifies it as a negative review (0), but I want to fine-tune the model on that exact case to say the review is positive (1).
Is there a way to fine-tune the already trained XGBoost model by adding specific data points like this? What would be the best approach to achieve this without retraining the whole model from scratch?
I've tried the following function:
# Fine tune the model
def fine_tune(model, inp, output, word2vec):
model.fit(
np.array([word2vec.get_mean_vector(tokenize(
inp
))]), np.array([output])
)
return model
However, when I run it it retrains the whole model on that single data point I provide it with.
Any guidance or suggestions would be greatly appreciated. Thank you!
英文:
I have trained an XGBoost classification model for sentiment analysis of product reviews. However, there are certain cases where the model predictions are not as expected. For example, when I input the review "The delivery was a bit late but the product was awesome", the model classifies it as a negative review (0), but I want to fine-tune the model on that exact case to say the review is positive (1).
Is there a way to fine-tune the already trained XGBoost model by adding specific data points like this? What would be the best approach to achieve this without retraining the whole model from scratch?
I've tried the following function:
# Fine tune the model
def fine_tune(model, inp, output, word2vec):
model.fit(
np.array([word2vec.get_mean_vector(tokenize(
inp
))]), np.array([output])
)
return model
However, when I run it it retrains the whole model on that single data point I provide it with.
Any guidance or suggestions would be greatly appreciated. Thank you!
答案1
得分: 1
以下是你要翻译的代码部分:
import xgboost as xgb
import numpy as np
def fine_tune(model_, X, y, loop=False, num_boost_rounds=30, params=None):
"""
Fine-tune an XGBoost model using incremental training.
Args:
- model_: str, xgboost.core.Booster, path / object of the model to be fine-tuned.
- X: array-like, shape (n_samples, n_features), input data for training.
- y: array-like, shape (n_samples,), output (target) data for training.
- loop: bool, loop the training process until X predicts y perfectly.
- num_boost_rounds: int, number of boosting rounds.
- params: dict, parameters for the model.
Returns:
- model: the fine-tuned XGBoost model.
"""
if isinstance(model_, str):
# Load the existing model
model = xgb.Booster()
model.load_model(model_)
elif not isinstance(model_, xgb.Booster):
try:
model = model_.get_booster()
except:
raise ValueError("The model must be either a string to a file or an XGBoost model.")
if isinstance(model_, (xgb.Booster, str)):
assert params is not None, "The params argument must be provided when loading a model from a file or a Booster model."
param = params if params is not None else model_.get_params()
# Convert the input to DMatrix
dX = xgb.DMatrix(X, label=y)
# Train the model
model = xgb.train(param, dX, num_boost_rounds, xgb_model=model)
if loop:
# Loop the training process until the model predicts perfectly
while True:
y_pred = model.predict(dX)
y_pred = np.where(y_pred > 0.5, 1, 0)
if np.all(y_pred == y):
break
model = xgb.train(param, dX, num_boost_rounds, xgb_model=model)
if not isinstance(model_, (str, xgb.Booster)):
# Update the internal booster
model_._Booster = model
return model
希望这有所帮助。
英文:
Thanks to @Laassairi Abdellah he was able to redirect me incremental training. Armed with that knowledge I've made this function:
import xgboost as xgb
import numpy as np
def fine_tune(model_, X, y, loop=False, num_boost_rounds=30, params=None):
"""
Fine-tune an XGBoost model using incremental training.
Args:
- model_: str, xgboost.core.Booster, path / object of the model to be fine-tuned.
- X: array-like, shape (n_samples, n_features), input data for training.
- y: array-like, shape (n_samples,), output (target) data for training.
- loop: bool, loop the training process until X predicts y perfectly.
- num_boost_rounds: int, number of boosting rounds.
- params: dict, parameters for the model.
Returns:
- model: the fine-tuned XGBoost model.
"""
if isinstance(model_, str):
# Load the existing model
model = xgb.Booster()
model.load_model(model_)
elif not isinstance(model_, xgb.Booster):
try:
model = model_.get_booster()
except:
raise ValueError("The model must be either a string to a file or an XGBoost model.")
if isinstance(model_, (xgb.Booster, str)):
assert params is not None, "The params argument must be provided when loading a model from a file or a Booster model."
param = params if params is not None else model_.get_params()
# Convert the input to DMatrix
dX = xgb.DMatrix(X, label=y)
# Train the model
model = xgb.train(param, dX, num_boost_rounds, xgb_model=model)
if loop:
# Loop the training process until the model predicts perfectly
while True:
y_pred = model.predict(dX)
y_pred = np.where(y_pred > 0.5, 1, 0)
if np.all(y_pred == y):
break
model = xgb.train(param, dX, num_boost_rounds, xgb_model=model)
if not isinstance(model_, (str, xgb.Booster)):
# Update the internal booster
model_._Booster = model
return model
The loop section of this code is specific to my use case of binary classification as in it is either 1 or 0.
Example usage:
fine_tune(model,
np.array([word2vec.get_mean_vector(tokenize(
"The delivery was a tiny bit late but the product was sleek and high quality"
))]), np.array([1]), loop=True
)
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